I never said he isn't a good runner. It's a great time and a good run. I'm sure he is 1:43/1:44 material. If not faster.
The point I'm making is where is Rudisha, where is Bosse on that 600m indoor list? It has not been attacked by the big names over the years and so is weak. The WR should be in the 1:13.5 region.
I don't remember Korir doing that well against the big boys when it mattered neither.
Really? Korir goes from 1:46.9 in 2016 to 1:43.10 in 2017. He wins NCAAs (indoor and outdoor), Kenyan trials, Monaco...
...and because he only makes it to the WC semi final in mid August, you are unimpressed. How fast are you?
BTW: Bosse's indoor best is 1:15.63. He only has a 400m best of 47.54. (Korir' best is 44.53 and Saruni's best is 45.69).